689605 has 32 divisors (see below), whose sum is σ = 1071360. Its totient is φ = 414720.

The previous prime is 689603. The next prime is 689621. The reversal of 689605 is 506986.

It is not a de Polignac number, because 689605 - 2¹ = 689603 is a prime.

689605 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11275 + ... + 11335.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2⁶⁸⁹⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

689605 is a deficient number, since it is larger than the sum of its proper divisors (381755).

689605 is a wasteful number, since it uses less digits than its factorization.

689605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 689605 is about 830.4245901947. The cubic root of 689605 is about 88.3486939784.

The spelling of 689605 in words is "six hundred eighty-nine thousand, six hundred five".